Channel to Channel Phase Match
Using different filter selections (Wideband/Bessel IIR/Butterworth IIR/etc.) or different filter bandwidths results in phase mismatches between
channels.
Wideband
100 kHz Sine wave
800 kHz Sine wave
Channels on card
0.5 deg (14 ns)
2.0 deg (7 ns)
GN815 Channels within mainframe
0.5 deg (14 ns)
2.0 deg (7 ns)
Bessel IIR, Filter frequency 200 kHz @ 2 MS/s
Channels on card
0.5 deg (14 ns)
GN815 Channels within mainframe
0.5 deg (14 ns)
Butterworth IIR, Filter frequency 200 kHz @ 2 MS/s
Channels on card
0.5 deg (14 ns)
GN815 Channels within mainframe
0.5 deg (14 ns)
Elliptic IIR, Filter frequency 200 kHz @ 2 MS/s
Channels on card
0.5 deg (14 ns)
GN815 Channels within mainframe
0.5 deg (14 ns)
GN815 channels across mainframes
Defined by synchronization method used (None, IRIG, GPS, Master/Slave, PTP)
Channel to Channel Crosstalk
Channel to channel crosstalk is measured with a 50 Ω termination resistor on the input and uses sine wave signals on the channel above and
below the channel being tested. To test Channel 2, Channel 2 is terminated with 50 Ω, while Channels 1 and 3 are connected to the sine wave
generator.
1000
100
10
1
0.1
Frequency [kHz]
20 mV: Crosstalk overview
Magnitude
[dB
]
-140
-160
-120
-100
-80
-60
-40
-20
0
Figure A.188:
Representative crosstalk overview
On
-
board Memory
Per card
2 GB (1 GS @ 16 bits, 500 MS @ 18 bits storage)
Organization
Automatically distributed amongst channels enabled for storage or real
-
time calculations
Memory diagnostics
Automatic memory test when system is powered on but not recording
Storage sample size
User selectable 16 or 18 bits
16 bits, 2 bytes/sample
18 bits, 4 bytes/sample (required for Timer/Counter usage)
GEN3t
I3995-3.1 en HBM: public
647